From https://once.com/writebook

app/models/leaf/editable.rb

@@ -0,0 +1,69 @@
+module Leaf::Editable
+  extend ActiveSupport::Concern
+
+  MINIMUM_TIME_BETWEEN_VERSIONS = 10.minutes
+
+  included do
+    has_many :edits, dependent: :delete_all
+
+    after_update :record_moved_to_trash, if: :was_trashed?
+  end
+
+  def edit(leafable_params: {}, leaf_params: {})
+    if record_new_edit?(leafable_params)
+      update_and_record_edit leaf_params, leafable_params
+    else
+      update_without_recording_edit leaf_params, leafable_params
+    end
+  end
+
+  private
+    def record_new_edit?(leafable_params)
+      will_change_leafable?(leafable_params) && last_edit_old?
+    end
+
+    def last_edit_old?
+      edits.empty? || edits.last.created_at.before?(MINIMUM_TIME_BETWEEN_VERSIONS.ago)
+    end
+
+    def will_change_leafable?(leafable_params)
+      leafable_params.select do |key, value|
+        leafable.attributes[key.to_s] != value
+      end.present?
+    end
+
+    def update_without_recording_edit(leaf_params, leafable_params)
+      transaction do
+        leafable.update!(leafable_params)
+
+        edits.last&.touch
+        update! leaf_params
+      end
+    end
+
+    def update_and_record_edit(leaf_params, leafable_params)
+      transaction do
+        new_leafable = dup_leafable_with_attachments leafable
+        new_leafable.update!(leafable_params)
+
+        edits.revision.create!(leafable: leafable)
+        update! leaf_params.merge(leafable: new_leafable)
+      end
+    end
+
+    def dup_leafable_with_attachments(leafable)
+      leafable.dup.tap do |new|
+        leafable.attachment_reflections.each do |name, _|
+          new.send(name).attach(leafable.send(name).blob)
+        end
+      end
+    end
+
+    def record_moved_to_trash
+      edits.trash.create!(leafable: leafable)
+    end
+
+    def was_trashed?
+      trashed? && previous_changes.include?(:status)
+    end
+end